In a food chain, approximately what percentage of energy is transferred from one trophic level to the next?

Which one of the following is most sensitive to environmental change?

Standing water, in the form of a lake/swamp, is called:

With reference to lichens, which of the following statements is/are correct? 1. Lichens are very good indicators of pollution. 2. Lichens grow well in polluted areas.

Which of the following is NOT a biogeochemical cycle?

Which of the following is correct sequence of ecosystem in order of decreasing productivity?